scholarly journals Assessment of heavy metals in RDF for thermochemical conversion

2020 ◽  
Vol 158 ◽  
pp. 04006
Author(s):  
Ismail Babatunde Adefeso ◽  
Daniel Ikhu-Omoregbe ◽  
Yusuf M. Isa
Keyword(s):  
Heavy Metals ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Bottom Ash ◽  
Cape Town ◽  
Waste To Energy ◽  
Thermochemical Conversion ◽  
Solid Waste Disposal ◽  
High Concentrations

Thermal treatment applications towards production of energy from raw and pre-treated municipal solid waste (MSW) are continuously growing context in contemporary waste-to-energy technology. The quality of MSW needs an improved analysis to enhance her choice of energy exploitation and environmental assessment of fly and bottom ashes associated with thermochemical conversions. The MSW were collected from municipal solid waste disposal facilities (MSWDF) in Cape Town to investigate heavy metals distributions in MSW. The MSW were pre-treated to improve the quality of MSW. The 7700 Series quadrupole ICP-MS solution method was used to determine concentrations and distributions of some heavy metals from MSWDF in Cape Town. This study further predicted distributions of heavy metals in fly and bottom ashes by a model. The results showed that accumulation of high concentrations of heavy metals in bottom ash residue could be a good remedy for heavy metals control. The heavy metals (especially Pb, Zn and Hg) emissions could be technically monitored and controlled from escaping to urban air-sheds atmosphere and prevent from their consequential secondary environmental and health implication.

Preliminary Assessment of Heavy Metals in Refuse Derived Fuel (RDF) for Thermochemical Conversion

2021 ◽  
Vol 47 (2) ◽  
pp. 297-305
Author(s):  
Ismail Babatunde Adefeso ◽  
Daniel Ikhu-Omoregbe ◽  
Yusuf M. Isa
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Solid Waste ◽  
Bottom Ash ◽  
Cape Town ◽  
Thermochemical Conversion ◽  
Solid Waste Disposal ◽  
Transfer Coefficients ◽  
Refuse Derived Fuel ◽  
High Concentrations

Thermochemical conversion of raw municipal solid waste (MSW) is continuously growing in the context of contemporary technology. The quality of MSW needs an improved analysis to enhance the choice of energy exploitation and environmental assessment of fly and bottom ashes associated with thermochemical conversion. MSW was collected from solid waste disposal facilities (SWDF) in Cape Town in order to investigate heavy metal distributions in MSW obtained from SWDF. The MSW was pre-treated to improve its quality. The 7700 Series quadrupole ICP-MS solution method was used to determine the concentrations and distributions of some heavy metals from SWDF in Cape Town. This study assessed and quantified the distributions of heavy metal in MSW in the city of Cape Town. The accumulation of high concentrations of heavy metals in bottom ash residue from thermochemical conversion could be a good remedy for heavy metals control. High transfer coefficients of heavy metals were observed, and the heavy metals were mainly transferred to the bottom ash. Heavy metals such as Cd, Cu, Pb, and Zn in bottom ash are regarded as relatively unstable with the highest concentrations of Cu and Zn 1295 mg/Kg and 3347 mg/Kg, respectively. The heavy metals (especially Pb, Zn and Hg) emissions were technically monitored and controlled from escaping into the urban air-sheds atmosphere and prevented from their consequential secondary environmental and health implications.

The fate of heavy metals and salts during the wet treatment of municipal solid waste incineration bottom ash

2021 ◽  
Vol 121 ◽  
pp. 33-41
Author(s):  
Yanjun Hu ◽  
Lingqin Zhao ◽  
Yonghao Zhu ◽  
Bennong Zhang ◽  
Guixiang Hu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Bottom Ash ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration

Determination of Residual Heavy Metals in an Incinerator Bottom Ash from Municipal Solid Waste Power Plant

2020 ◽  
Vol 901 ◽  
pp. 65-71
Author(s):  
Woravith Chansuvarn
Keyword(s):  
Heavy Metals ◽  
Power Plant ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Microwave Digestion ◽  
Bottom Ash ◽  
Flame Atomic Absorption ◽  
Digestion Technique ◽  
Relative Standard ◽  
Copper Zinc

Bottom ash is a part of by-product from the municipal solid waste power plants which is always a wider problem for the urban and rural communities due to its disposal plants may cause serious environmental pollution. This work was focused on the residual heavy metal in an incinerator bottom ash from the municipal waste power plant placed in Nongkham district, Bangkok. Four bottom ash samples were obtained in 2017. After drying and grounding, the bottom ash samples were prepared to clear solution with the microwave digestion technique using nitric, hydrochloric and hydrofluoric acid under the heating program. The total residual heavy metals in the incinerator bottom ashes, such as lead, copper, zinc, and cadmium were determined by using flame atomic absorption spectrophotometer (FAAS) with deuterium background correction. The total concentration of lead, copper, zinc and cadmium were found in the range of 280.40-354.22mg kg-1, 365.35-524.45 mg kg-1, 1,527.25-2,074.34 mg kg-1, and 0.48-1.02 mg kg-1, respectively. The recovery of all metals was found in the range of 89.4-101.2% and the relative standard deviation (RSD) was to be 2.15-3.55 % (n=7). The concentration of zinc, copper, and lead was found high levels, while cadmium was low concentration. Heavy metals in solid waste material occur in different chemical forms and phases. The sample preparation based on the microwave digestion was successfully developed for the waste samples with a good reliability.

Use of Municipal Solid Waste Incineration Bottom Ash in Adsorption of Heavy Metals

2011 ◽  
Vol 474-476 ◽  
pp. 1099-1102
Author(s):  
Hai Ying Zhang ◽  
Yi Zheng ◽  
Hong Tao Hu ◽  
Jing Yu Qi
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Residence Time ◽  
Bottom Ash ◽  
Waste Incineration ◽  
Synthetic Wastewater ◽  
High Porosity ◽  
Municipal Solid Waste Incineration

Bottom ash from municipal solid waste incineration (MSWI) has been previously suggested as an adsorbent for removing heavy metals from wastewater due to its high porosity and large surface area. In this study the adsorption characteristics of heavy metals were investigated using various particle sizes of MSWI bottom ash. The adsorption experiment was conducted using synthetic wastewater containing Cu, Zn, Pb and Cd as a function of residence time, initial pH, ash dosage and particle size, respectively. The adsorption rate increased with decreasing particle size and with increasing residence time. Through the above analysis, this work proved that bottom ash was effective in adsorbing the four heavy metals.

scholarly journals CONCENTRATION OF HEAVY METALS IN THE SOIL AND PLANTS AROUND WASTE DUMPSITES IN ENUGU METROPOLIS, NIGERIA

2019 ◽  
Vol 3 (1) ◽  
pp. 13
Author(s):  
M. N. Okeke ◽  
Paul Chukwuka Eze ◽  
C. N. Eze
Keyword(s):  
Heavy Metals ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Control Sample ◽  
Control Site ◽  
Soil Samples ◽  
Control Measures ◽  
Plant Sample ◽  
Solid Waste Disposal ◽  
Dump Site

<strong>Aims:</strong> The purpose of this project is to find the concentration of heavy metals (Cu, Zn, Pb, As, Cr, Ni, Cd, Fe and Mn) in the top soil and the plant around the waste dumpsite from Enugu municipal solid waste disposal sites. <strong>Methodology and results: </strong>This was done through collection of soil samples from four designated public municipal solid waste dump sites (Ngwo Umueze, Presidential, New-market and Emene) in Enugu metropolis. The soil samples were collected at 10 metres intervals away from the centre location point of each dump site at constant depth (0 - 15 cm were mixed together and sample picked from it). The samples collection design are as follows: centre (0m) of the dump sites, 10 metres, 20 metres, 30 metres and the control sample which measured 65 metres away from the centre of dumpsites at the same depth. Plant samples were taken just at the centre (0m) and control measures which is at 65 meters distance away from each dump sites. The Goat grasses harvested were taken to the lab to check and analyse its heavy metals intake from the soil. These samples were analysed using atomic absorption spectrophotometer (AA320N) model. On the average, high concentrations of Zn, Fe, Mn, Cu, and Pb were found in the soil samples collected at the centre of the dump sites as 141.70, 121.5, 75.53, 70.33 and 64.53mg/kg respectively. The lower concentrations were obtained in the soil samples taken at the control site which 65 metres distance away from the centre of the four dump sites as 12.00, 81.55, 8.70, 9.56 and 6.51mg/kg for Zn, Fe, Mn, Cu, and Pb respectively. In the plant sample, concentration of Fe (98.00 mg/kg) was found to be the highest in the root at New market dumpsites, while Nil concentration of as (Nil mg/kg) was the least value at Emene from the control distance. <strong>Conclusion, significance and impact study:</strong> SPSS statistical package was used to find out the significant differences between the treatments mean (heavy metals). The result shows that the heavy metals analyses were within the acceptable or permissible limit by WHO/FAO.

scholarly journals Stabilization of Municipal Solid Waste Fly Ash, Obtained by Co-Combustion with Sewage Sludge, Mixed with Bottom Ash Derived by the Same Plant

2020 ◽  
Vol 10 (17) ◽  
pp. 6075
Author(s):  
Ahmad Assi ◽  
Fabjola Bilo ◽  
Alessandra Zanoletti ◽  
Laura Borgese ◽  
Laura Eleonora Depero ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Sewage Sludge ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Coal Fly Ash ◽  
Bottom Ash ◽  
Solid Material ◽  
Flue Gas Desulfurization ◽  
Stabilization Method

This study presents an innovative stabilization method of fly ash derived from co-combustion of municipal solid waste and sewage sludge. Bottom ash, obtained from the same process, is used as a stabilizing agent. The stabilization method involved the use of two other components—flue gas desulfurization residues and coal fly ash. Leaching tests were performed on stabilized samples, aged in a laboratory at different times. The results reveal the reduction of the concentrations of heavy metals, particularly Zn and Pb about two orders of magnitude lower with respect to fly ash. The immobilization of heavy metals on the solid material mainly depends on three factors—the amount of used ash, the concentrations of Zn and Pb in as-received fly ash and the pH of the solution of the final materials. The inert powder, obtained after the stabilization, is a new eco-material, that is promising to be used as filler in new sustainable composite materials.

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